Reamer.



A. KOGHER.

BEAMER.

APPLICATION FILED 111111.17, 1913.

Patented J an. 6, 1914.

INVENTOR I @J1/Gehen ALBERT KOCHER, OF EAST PITTSBURGH, PENNSYLVANIA.

BEAMER.

inseam.

Specification of Letters Patent.

Patented Jan. 6,1914.

Application filed March 17, 1913. Serial No. 754,804.

To all 'whom t may concern:

Be it known that li., ALBERT KooHnR, a subject of the Emperor of Germany, residing at East Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Beamers, of which the following is a specification, reference being had therein to the accompanying drawing.

rlhis invention relates to reamers, and the object of my invention is the provision of positive and reliable means, as hereinafter set forth, for locking a reamer bit relatively to a spindle, whereby the -liability of the reamer becoming displaced when in operation is reduced to a minimum.

I accomplish the above objects by a tool that has a locking washer for holding` a reamer upon a spindle and the construction of the locking washer is such that it can be easily and quickly placed in position, manufactured at a comparatively small cost and used without interfering with the operation of the reamer.

The invention will be hereinafter specifically described and then claimed and reference will now be had to the drawing, wherein Figure 1 is a side elevation of a reamer spindle, Fig. 2 is an elevation of a locking washer, Fig. 3 is a longitudinal sectional view of the reamer body, Fig. 4 is a longitudinal sectional view of the assembled elements shown in Figs. 1 to 3 inclusive, and Fig. 5 is a plan of a locking washer.

Further describing my invention in detail with reference to the accompanying drawing wherein like numerals denote corresponding parts throughout: 1 denotes a drill shaft having the end thereof reduced to provide a spindle 2 and an annular shoulder 3. The shoulder 3 is provided with diametrically opposed sockets 4 and the end of the spindle 2 is screw threaded, as at 5.

6 denotes a washer that has one side thereof provided with diametrically opposed lugs 7 adapted to engage in the sockets 4, and the opposite side of the washer 6 has diametrically opposed lugs 8, said lugs having a position at substantially a right angle to the position of the lugs 7, whereby any stresses or strains upon the washer will be equally distributed.

9 denotes a tubular reamer body having cutting edges 10. The inner end of the body has sockets 11 to receive the lugs 8 of the washer 6 and the outer end of the reamer body is interiorly screw threaded, as at 12 to receive the threaded spindle 2.

After the washer 6 has been placed upon the spindle 2 with the lugs extending into the sockets 4, a coiled spring 13 is placed upon the spindle against the washer t3, said spring having preferably one convolution. The reamer body 9 is then screwed upon the spindle 2 in proximity to the washer 6. The reamer body is positioned whereby the sockets 11 will aline with the lugs 8 and then the washer is shifted until the lugs 8 engage in the sockets 11. The reamer body 9 and the washer 6 are then revolved a half revolution of the spindle whereby the lugs will again register with the sockets. rlhe washer 6 is again shifted to place the lugs 7 in the sockets 4 thereby moving the lugs 8 out of the sockets 11. rlhe reamer body can then be rotated a half of a revolution and this operation can be continued until the reamer body has reached such a point as to be locked in the manner shown in Fig. 4. The coiled spring 13 cooperates with the locking washer in maintaining the lugs 7 and 8 in the sockets 4 and 11 respectively. The reamer body cannot become accidentally displaced and cannot be removed except by manually reversing the operation set forth above.

. One embodiment of my invention has been illustrated but it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claim.

1What l claim is zln a reamer, a drill shaft having the end thereof reduced to provide an annular shoulder having diametrically opposed sockets formed therein, the reduced end of said shaft having the end thereof screw threaded, a washer arranged upon said spindle and having the edges thereof provided with oppositely disposed lugs, the lugs upon one face of the washer being positioned intermediate Jthe lugs upon theother face of the Washer, of said Washer in the socket of said drill 10 'a tubular reamer body interiorly screw shaft. n threaded and adapted to be screwed upon In testimony whereof I affix my Signature said spindle, fthe inner end of said -reamer iu'the presence oftwowitnesses.

5 body havingdiamerieally opposed socketsformed therein to receive the lugs on one ALBERT KOCHER edge of said Wash'elgfand :Le-oiled springin-j Wnesses:

terposed between said Washer and the inner MAX H. SROLOVITZ,

end of said reamer body to maintain the lugs KATHERINE ERRETT.

Gopies ofthisptent may :be obtained forlve `cents'eachyby addressing the Commissioner '01!"Iatentef;I -Washington,D. G. 

